I find that shooting one-handed is easier for precision shooting than two-handed. I guess part of it is that the way I see my sights makes it easier. Two hands works great for recoil management if you gotta get a bunch of rounds off quickly, but one hand works better for precision if you have all day.

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God gave you a mind.
Your parents gave you a body.
The Corps gave you a rifle.
Keep them all clean.